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Chapter 1 - Installation
11
For input and output, use wires with sufficient size to ensure voltage drop of less than 2%.
Motor torque may drop if operating at low frequencies and a long wire run between inverter and
motor.
When more than one motor is connected to one inverter, total wiring length should be less than 500m
(1,640ft). Do not use a 3-wire cable for long distances. Due to increased leakage capacitance
between wires, over-current protective feature may operate or equipment connected to the output
side may malfunction.
Connect only recommended braking resistor between the B1 and B2 terminals. Never short B1 and
B2 terminals. Shorting terminals may cause internal damage to inverter.
The main circuit of the inverter contains high frequency noise, and can hinder communication
equipment near the inverter. To reduce noise, install RFI filters or line noise filters on the input side of
the inverter.
Do not use power factor capacitor, surge suppressors, or RFI filters on the output side of the inverter.
Doing so may damage these components.
Always insure the LED and charge lamp for the power terminal are OFF before wiring terminals. The
charge capacitor may hold high-voltage even after the power is disconnected. Use caution to prevent
the possibility of personal injury.
Grounding
The inverter is a high switching device, and leakage current may flow. Ground the inverter to avoid
electrical shock. Use caution to prevent the possibility of personal injury.
Connect only to the dedicated ground terminal on the inverter. Do not use the enclosure or a chassis
screw for grounding.
The protective earth conductor must be the first one in being connected and the last one in being
disconnected.
As a minimum, grounding wire should meet the specifications listed below. Grounding wire should be
as short as possible and should be connected to the ground point as near as possible to the inverter.
Grounding Wire Sizes, AWG (mm²)
Motor Capacity
200V class 400V class
0.5 ~ 5.4 HP 12 (3.5) 14 (2)
Ground Screw
WARNING